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Ejector

Active Publication Date: 2015-10-29
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent aims to improve the performance of an ejector in a refrigeration cycle device. It seeks to maintain the dryness of the fluid flowing into the nozzle portion of the ejector within a safe range to prevent reduction in the pressurizing performance of the ejector. By doing so, the device can maximize the heating capacity of the fluid in the heating heat exchanger.

Problems solved by technology

However, the refrigerant applied to the general ejector refrigeration cycle decreases its density with decreasing pressure.
Thus, when the refrigerant evaporation pressure in the exterior heat exchanger is drastically reduced, the density of the refrigerant drawn into the compressor is also reduced significantly, thus leading to a decrease in flow rate of the refrigerant flowing into the interior condenser.
As a result, the total amount of heat dissipated into air by the refrigerant in the interior condenser is lacking as compared to the amount of heat required for appropriate heating of the space to be air-conditioned, which cannot sufficiently heat the air.

Method used

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Experimental program
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Effect test

first embodiment

[0058]A first embodiment of the present disclosure will be described below with reference to FIGS. 1 to 9. In this embodiment, an ejector of the present disclosure is applied to a refrigeration cycle device 10 that is used in a vehicle air conditioner 1 to be mounted on an electric vehicle, which is designed to obtain a driving force for traveling from an electric motor for traveling. Thus, the refrigeration cycle device 10 is configured as the ejector refrigeration cycle. Further, air is a fluid to be heat-exchanged.

[0059]As shown in FIGS. 1 to 3, the refrigeration cycle device 10 can be configured to perform switching among a refrigerant circuit in an air cooling mode of cooling the vehicle interior by cooling the air (see FIG. 1); a refrigerant circuit in a weak dehumidification-air heating mode of dehumidifying and heating the vehicle interior by re-heating the air cooled and dehumidified (see FIG. 1); a refrigerant circuit in a dehumidification-air heating mode of dehumidifying...

second embodiment

[0220]In this embodiment, as shown in FIG. 10, the structure of the heating side ejector 15 is changed by way of example, as compared to the first embodiment. Specifically, the heating side ejector 15 includes a straight portion 15i having a certain refrigerant passage area on a side of a refrigerant injection port 15c located on the most downstream side in the refrigerant passage formed in a heating side nozzle portion 15a. Referring to FIG. 10, the same or equivalent parts as those described in the first embodiment are designated by the same reference numerals. The same goes for the following figures.

[0221]A length L in the refrigerant flow direction of a part provided with the straight portion 15i is equal to an equivalent diameter φD of the refrigerant injection port 15c. The term “equivalent diameter φD of the refrigerant injection port 15c” as used herein means a diameter of the refrigerant injection port 15c determined by converting its passage cross-sectional shape into a ci...

third embodiment

[0229]In this embodiment, as shown in the entire configuration diagram of FIG. 11, the cooling side ejector 20, cooling side gas-liquid separator 21, and fixed throttle 22 of the refrigeration cycle device 10 are removed from the structure of the first embodiment. On the other hand, the outlet side of the fourth flow rate adjustment valve 14d is connected to the refrigerant inlet side of the interior evaporator 23, and the refrigerant outlet side of the interior evaporator 23 is connected to the fifth three-way joint 13e by way of example, which will be described below.

[0230]That is, in the refrigeration cycle device 10, the fourth flow rate adjustment valve 14d configures the cooling side decompressor. The structures of other components of the refrigeration cycle device 10 except for the above points are the same as those of the first embodiment. Now, the operation of the above-mentioned structure will be described. In this embodiment, like the first embodiment, switching is perfor...

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PUM

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Abstract

A mixing portion that mixes an injection refrigerant and a suction refrigerant is formed in a range of an internal space of a heating-side body portion of a heating-side ejector from a refrigerant injection port of a heating-side nozzle portion to an inlet of a heating-side diffuser. Further, the mixing portion is formed in a shape that gradually decreases a refrigerant passage area toward a downstream side of a refrigerant flow, and a refrigerant passage area of the inlet of the heating-side diffuser is set smaller than that of the refrigerant injection port. Thus, the flow velocity of the mixed refrigerant is decelerated to a value lower than a two phase sound velocity within the mixing portion, thereby suppressing occurrence of shock wave in the heating-side diffuser and stabilizing the pressure increasing performance in the heating-side diffuser.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The application is based on Japanese Patent Applications No. 2012-252473 filed on Nov. 16, 2012, and No. 2013-127583 filed on Jun. 18, 2013, the contents of which are incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present disclosure relates to an ejector that draws a fluid by a suction effect of an injection fluid injected at high speed, while decompressing the fluid.BACKGROUND ART[0003]Conventionally, some ejectors are known to be applied to a vapor compression refrigeration cycle device and to serve as a decompressor. This kind of ejector includes a nozzle portion for decompressing a refrigerant, and is designed to draw a gas-phase refrigerant flowing out of an evaporator by a suction effect of an injection refrigerant injected from the nozzle portion, and to pressurize a mixed refrigerant including the injection refrigerant and the drawn refrigerant by a pressure-increasing portion (diffuser).[0004]Thus...

Claims

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Application Information

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IPC IPC(8): F04F5/46
CPCF04F5/46B05B9/002B05B12/008F25B9/08F25B2500/07B60H1/00921B60H2001/3298F25B41/00F25B2341/0011F25B2341/0015
Inventor AWA, RYOKONISHIJIMA, HARUYUKITAKANO, YOSHIAKIYAMADA, ETSUHISAITOH, SATOSHIKAYANO, KENTA
Owner DENSO CORP